In the Bible, things that are lower down, or under, physically, generally represent things that are lower or more external spiritually. In some cases, the lower things have been separated and put away to protect the good, but in others, it can mean that a less exalted idea or good desire is supporting a more exalted one.

(References: Arcana Coelestia 4564 [1-2], 8610, 9656)

In Genesis 15:2, this signifies a state deprived of good and truth and thus no longer representing the church. (Arcana Coelestia 4886[3]) Childless also signifies that there is no internal church. (Arcana Coelestia 1794)